JPS6124348A - Remote supervisory and controlling equipment - Google Patents

Abstract

PURPOSE:To attain commnication between a master station and each slave station even if a defect of a transmission lin takes place by forming a loop transmission line into one system providing at least two sets of supervisory controlllers, outputting a check signal to a controller to be supervised of the own system at communication fault, giving a release signal to a supervisory controller of the other system, discriminating a faulty section of the own system and proviing a switching command of a faulty section. CONSTITUTION:It is supposed that a fault takes place between slave stations 20c, 20d in the 2nd system transmissio line 100b. A fault detection section 40e outputs a reception fault signal when a prescribed time is elapsed. Then a fault processing section 40d uses a reception fault signal outputted from a fault detection section 40e to give a command alternately repetively a mode changeover of the right end terminal changeover and the left end terminal changeover to a transmission circuit chanbeover circuit 50 to attain the changeover. When a check signal from a master station is received, the terminal station mode at reception of the check signal is stored, a fault processing section 40d transmits a normal signal to allow the master station to transmit it and then mode changeover is conducted, where the station becomes again a relay slave station after the normal signal is transmitted.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is directed to a remote monitoring and control device having one loop-shaped transmission line, which enables communication between a master station and a slave station even when there is a line failure in the transmission line. The present invention relates to a remote monitoring and control device that enables this.

[Technical background of the invention and its problems] For example, as shown in FIG.
and a plurality of controlled station devices (slave stations) 2 are connected through loop-shaped transmission lines 3a, 3b, each slave station 2 is preset with a specific identification code, and the master station 1 identifies the The code and command information are output to the transmission line 3a (or 3b), and this output is given to the slave station 2 one after another, and the slave station 2 receives the information transmitted by the built-in transmission control section 2a, If the identification code is checked and the call is not for the own station, the identification code and command contents are transferred as they are to the next slave station 2, and the corresponding slave station 2 receives the transmitted command contents and makes its own call. There is a remote monitoring and control device that responds to a command and sends the response contents back to the master station 1. Furthermore, 1a
is the transmission control section of the master station 1.

In the case of such a device, the transmission path is a unidirectional line in which the transmission direction is from the master station, through the slave stations, and back to the master station, and furthermore,
Multiple slave stations are connected in series on the transmission line, and the transmission content is transferred to the next slave station in sequence. Therefore, in the unlikely event that the line on the transmission line breaks at any point, the transmission line will be connected to the next stage after the breakage point. Two transmission lines 3a and 3b are used to communicate with the slave station.
In the unlikely event that one transmission line is disconnected, it is common to use duplex systems so that communication can be performed using multiple transmission lines.

However, in cases where there is only one transmission line, such as when replacing an existing remote monitoring and control device, or where only one transmission line can be installed due to economic constraints, the transmission line There is a drawback that when a failure occurs, a communication error occurs, making it impossible to monitor and control slave stations.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to provide a system in which only one system of seven loop-shaped transmission lines can be installed between a master station and a plurality of slave stations. [Summary of the Invention] That is, in order to achieve the above object, the present invention connects a plurality of monitored control devices with a loop-shaped transmission path, Therefore, in the remote monitoring and control equipment that sends and controls various commands to each monitored and controlled device and receives the responses, the above transmission line is one system, and at least two sets of monitoring and control equipment are provided. Each supervisory control device has a group of monitored control devices whose terminal terminal is a preset monitored control device, and the system is divided into separate systems, and each supervisory control device has a communication abnormality with the monitored control device of its own system. At the same time, a check signal is sequentially output to each monitored control device in the own system to check whether communication is possible, and a relief signal is given to the monitoring control devices in other systems, depending on whether there is a normal signal from the monitored control device in the own system. means for determining a faulty section of the own system and giving a switching command to make the monitored control device before the faulty section the terminal terminal of the own system; Switch the monitoring control device to relay status,
Means is provided for determining the faulty section of the transmission line by giving an investigation signal to the monitored controlled device in the subsequent stage, and outputting a command to switch the monitored controlled device before the faulty section to the terminal of its own system. In addition, each of the monitored control devices has a switching circuit that switches the connection state with the transmission line to the left terminal, right terminal, or relay state, and in the event of a communication error, this switching circuit switches the connection state to the left terminal or cloth terminal. The present invention is characterized in that it is provided with a means for alternately switching control, and upon receiving an investigation signal from a supervisory control device, sending a normal signal to the transmission line to return to the relay state.

In the device of the present invention having such a configuration, two sets of supervisory control devices are provided in one transmission line, and each of these supervisory control devices is a group of monitored control devices whose terminal terminal is a preset monitored control device. is divided into systems under management, and each supervisory control device outputs an investigation signal to check whether communication is possible to each monitored control device in its own system in sequence when there is an abnormality in communication with the monitored control device in its own system, and A relief signal is given to the monitoring and control devices in other systems, and each of the monitored control devices in the communication abnormal system detects the communication abnormal state and changes the connection state with the transmission path to the left end terminal and right end terminal state. Switching control and monitoring I11
Upon receiving the investigation signal from the control device, the supervisory control device sends a normal signal to the transmission line and returns to the relay state, thereby determining the faulty section of its own system based on the presence or absence of a normal signal from the monitored control device of its own system. to give a switching command to make the monitored control device before the faulty section the terminal terminal of the own system, and to switch the monitored control device before the faulty section to the terminal monitored control device of the own system, and The supervisory control device in another system that has received the rescue signal switches the terminal monitored control device of the monitored control device in its own system to the relay state, and gives a check signal to the subsequent monitored control device to restart the transmission path. determines the faulty section, outputs a command to switch the monitored control device before the faulty section to the terminal of its own system, and switches the monitored control device before the faulty section.
By setting it as the terminal monitored control device of the own system, even when a loop-shaped transmission line connecting the monitoring control device and multiple monitored control devices can only be installed in one system, even if a failure occurs in the transmission path, Eliminate that section and enable communication between the supervisory control device and each monitored and controlled device to prevent monitoring and control of the monitored system [I device] from becoming impossible due to a failure in the transmission line.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the basic configuration of a remote monitoring and control device according to the present invention. In the figure, 10a.

10b is a control center device (master station), and 2
0a and 20e are controlled station devices (slave stations), respectively. The master station 10a and the slave station 20b are connected by a first system transmission line 100a, with the slave station 20a interposed in the middle.
Moreover, between the master station 10b and the slave station 20b, the slave stations 20e and 2
0d and 20c, and are connected by a transmission line 100b of the second system, and the slave station 20b is connected to the transmission line 100 of each system.
It forms a turning point between a and 100b, and serves as a terminal slave station. Therefore, from now on, slave station 2 in this state
0b is called the terminal slave station, and other slave stations 20a, 20G, ~2
0e will be called a relay slave station. In addition, 30 is the master station 10
4o is a transmission control section built into each of the slave stations 20a and 20e.

As shown in FIG. 2, the present invention detects a defective point 200 when there is a line failure in the transmission line, switches the slave stations on both sides to the terminal slave station, and sets the other slave stations as relay slave stations. ,
This system automatically eliminates line failures to prevent any slave stations from becoming uncontrollable, and each slave station is configured to be able to change the transmission line connection. Therefore, in this device, the loop-shaped transmission line is actually only for one system, but by forming a terminal terminal layer, one side is for the first system and the other is for the second system when viewed from this terminal layer. It is divided into transmission lines.

FIG. 3 is a block diagram showing the configuration of the transmission control system of the slave station of the device according to the present invention. In the figure, 100 is a transmission path, and one is assumed to be an outgoing path and the other is an incoming path. Here, the outgoing path is indicated by a subscript. q and a subscript r for the return trip. 40 is a transmission control unit, ATTl, ATT2 are attenuators,
BPF is a bandpass filter, LPF is a low-pass filter, DEM
5 is a demodulator that demodulates the modulated transmission signal, MOD is a modulator that modulates the transmission signal sent from the transmission control section 40, and 50 is a transmission circuit switching circuit. This transmission circuit switching circuit 50 includes relay switches 5W1a, ~5W1c, which relay to the next-stage slave station, and a left terminal switch S Vv' 2 a for a left terminal not formed, and a right terminal switch 5W2C1 for a right terminal not formed. Switch S, W3a, ~5W3
The relay switch 5W1a has connecting terminals Tb and T.
It is connected between O. Connection terminals Tb and Tc are connected to transmission line 1 via isolation transformers 150b and 150G, respectively.
00(r) in series. The relay switch SW Ib is connected in parallel with the left terminal switch 5W2b, with one end connected to the connection terminal Ta and the other end connected to the connection terminal Tc via the right terminal switch 5W3b. Further, the relay switch 5W1C is connected in parallel with the right terminal switch 5W3c, and one end thereof is connected to the connection terminal Td.
Also, connect the other end to the left termination switch. Furthermore, a connection terminal Ta.

There is a right terminal switch 5-W3a between the TLDs, and
A left terminal switch 2a is connected between the connection terminals Tc and Td. 150a and 150d are isolation transformers. Of these, the isolation transformer 150a has one end connected to the connection terminal Ta, and the insulation 1 to lance 150d have one end connected to the connection terminal Td, and the other end is connected to the transmission line 1ooq.
connected in series.

Further, the insulation transformer 150b has one end connected to the connection terminal Tb, and the insulation transformer 150c has one end connected to the connection terminal Tc, and the other end connected in series to the transmission line 100r. That is, the transmission path 100 is configured such that the lines are connected via the transmission circuit switching circuit 50 in the slave station. Each switch swi of the circuit switching circuit 50,
-5w1CSS W 2 a, ~S W 2 C,
S W 3 a to S W 3C are respectively closed by setting the relay mode, left end terminal mode, and right end terminal mode, and the relay circuit, left end terminal circuit, and right end terminal circuit are set.

゛ Furthermore, each switch SW1 of the circuit switching circuit 50
．． ~5W1c, 5W2a, ~5W2cS 5W3
Although a, to S W 3 G are formed here using, for example, relay contacts, they may be formed with something other than a relay if the lines of the transmission path can be rearranged.

The connection between the transmission control unit 40 and the transmission line 100 in the slave station is made on the receiving side from the connection point between the relay switch SW1b and the right terminal switch 5W3c, through the bandpass filter BPF, the attenuator ATT1, and the demodulator DEM. Also, on the receiving side, a relay switch 5W1c and a left terminal switch 5W2c
From the connection point with low-pass filter LPF, - attenuator ATT
2, through the modulator MOD.

FIG. 4 shows a functional block diagram of the slave station. Here, the same parts as in FIG. 3 are given the same reference numerals. The transmission control section 40 includes a control communication section 40a, an interface 40b, a display communication section 40C1, an abnormality processing section 40d, and an abnormality detection section 40e. Here, the control communication unit 40a filter-links the received signal received from the transmission line 100 via the transmission circuit switching circuit 5-0 with a band filter BPF, extracts only the band component, and adjusts the received signal to an appropriate level with an attenuator ATT1. After attenuating the signal to a signal, the demodulator DEM receives the demodulated signal, and based on the identification code contained in this signal, it determines whether the information is for itself or not.If the call is for itself, it is subsequently sent. In response to information such as commands received, it quickly provides control output, etc. to devices such as controlled devices and switchboards connected to the slave station via the interface 40b, or obtains information on these devices, and also , has a function of outputting this investigation signal to the abnormality processing section 40d when receiving an abnormality investigation command from the master station. The display communication section 40c outputs signals such as information sent via the interface 40b, and the output is modulated by a modulator MOD, attenuated by an attenuator ATT2, and the signal level is adjusted. The left terminal switch 5W2C of the transmission circuit switching circuit 50 is connected to the right terminal switch 5 through the low-pass filter LPF.
Give it to the connection point with W3c.

Further, the abnormality detection section 40e monitors the reception state of the control communication section 40C, and checks whether or not a signal is received from the transmission path at every predetermined time, and even if a certain period of time or more elapses, the reception state is not detected. If there is no signal, it has a function of outputting a reception abnormality signal instructing a line abnormality test of the transmission line. Further, the abnormality processing unit 40d uses the reception abnormality signal outputted by the abnormality detection unit roe to cause the transmission circuit switching circuit 50 to switch to the right end terminal switching mode and the left end terminal switching mode until it receives the investigation signal from the master station. When switching is performed by repeatedly instructing switching and receiving a survey signal from the master station, the terminal mode at the time of reception of the survey signal is stored, and the abnormality processing unit 4 = Od
transmits a normal signal and transmits it to the master station via the display communication unit 40c, and after transmitting the normal signal, it switches the mode again to become a relay slave station, and also changes the mode at a constant rate. It has a function to switch to the previously stored terminal mode when the unreceivable state continues or when a mode switching command is received from the master station.

FIG. 5 is a functional block diagram of parents 810a and 10b,
T11. TI2 is an isolation transformer for insulating connection of the signal line to the transmission line 100. Also, DEMI is the demodulator, M
ODl is a modulator. The transmission control unit 30 of the master stations 10a and 10b includes a control communication unit 30a, an interface 30b,
Display communication section 3Qc, abnormality processing section 30d, abnormality detection section 30
It has e. Here, the control communication unit 30a outputs information such as slave station identification codes and commands sent from a control panel (not shown) via the interface 30b to the transmission line 100 via the modulator MODI and the isolation transformer TI2, and It has a function of sequentially outputting an investigation signal (anomaly investigation command) to each slave station upon receiving an investigation command from the abnormality processing section 30d.

In addition, the display communication unit 30G receives a response signal from the slave station obtained from the transmission line 100 via the isolation transformer T11 and the demodulator DEM1, and sends it to the control board via the interface 30b, and also outputs a normal signal from the slave station. It has a function of providing the signal to the abnormality processing section 30d when it receives the signal. The abnormality detection section 30e has a function of monitoring the reception state of the display communication section 30c and, when reception is not possible for a predetermined period of time, giving a reception abnormality command to the abnormality detection section 30e. Further, when the abnormality processing unit 30d receives an abnormal signal from a slave station, it gives a relief signal to another master station, and sequentially gives an investigation signal to all the slave stations that have been connected for a long time via the display communication unit 30c. When a normal signal is not obtained from the slave station that gave the investigation signal, it is determined that there is a failure between the slave station and the slave station upstream, and the information is sent to the control communication unit 30a. It has a function of storing a command to the control communication unit 30a to issue a command to switch the mode to the upstream slave station closest to the failure point, which becomes the terminal terminal of the transmission path of the own system. Furthermore, when receiving a relief signal from another master station, it gives a command to each slave station belonging to its own system via the control communication unit 30a to switch to relay mode, and checks each slave station in turn. Give a signal, check whether there is a normal signal reply from the slave station, and if there is no normal signal reply, recognize that there is an abnormality between the slave station and the slave station upstream of that slave station, and memorize it. However, it has a function of giving a mode switching command to the upstream slave station to become the terminal slave station of its own system.

Next, the operation of this device having the above configuration will be explained.

Now, each slave station 20a, ~20e and master station 10a, 10b are
Assume that the connection configuration shown in FIG. 6(a) is used, and a failure occurs between the slave stations 2dC and 20d on the transmission line 100b of the second system.

Here, ``the slave station 20 in the second transmission line 100b''
The connection relationship between the transmission lines 100b and 20e is as shown in FIG.

20e detects a reception abnormality. That is, each slave station 20C
1 to 20e control communication unit 40. Since a reception signal is not obtained even after a predetermined period of time has elapsed, the abnormality detection section 40e outputs a reception abnormality signal when the period of time has elapsed. Then, the abnormality processing section 40d uses the reception abnormality signal output from the abnormality detection section 40e to cause the transmission circuit switching circuit 50 to switch to the right end terminal switching mode and the left end terminal switching mode until it receives the investigation signal from the master station. The switching is performed by alternately and repeatedly instructing the switching (as shown in FIG. 6(b)). When receiving the investigation signal from the master station, the abnormality processing section 40d stores the terminal mode at the time of reception of the investigation signal, transmits a normal signal, and transmits it to the master station via the display communication section 40c. let After transmitting the normal signal, the abnormality processing unit 40d switches the mode so that it becomes a relay slave station again.

On the other hand, since the slave stations 20c and 2Od on the transmission line 100I are out of order, the master station 10b of the transmission line system is unable to receive from the slave stations.
The normality detection section 30e, which has been monitoring the reception state of the signal, detects a reception abnormality and outputs an abnormality signal to the abnormality processing section 30d. In other words, the abnormality processing section 3-0d gives a relief signal to another master station 10a, and outputs an investigation signal (abnormality investigation command) to each foal in sequence via the control communication section 30a. This is done from the nearest slave station.

Then, it is checked whether a normal signal is returned from each slave station that received this investigation signal, and if a normal signal is not obtained, it is determined that there is a failure between that slave station and the upstream slave station. It makes a judgment, stores the information, and gives a command to the control communication unit 30a to issue a mode switching command to the upstream slave station closest to the failure point to become the terminal terminal of the transmission path of its own system.

As a result, the slave station 20d closest to the failure point 200 from the master station 10b to the failure point 200 is set to be the left terminal slave station of the master station 10b.

In addition, the slave station 20G next to the failure point 200 will no longer receive the received signal from the master station 10b due to the transition of the slave station 20d to the left terminal terminal, The switching will be executed again.

On the other hand, the master station 1 of another system that received the relief signal from the master station 10b
0a gives a command via the control communication unit 30a to the terminal terminal slave station 2ob belonging to its own system to enter the relay mode (FIG. 6(C) shows the state when this relay mode is completed). ), the inquiry signal is sequentially given to the slave stations on the downstream side of the slave station 20b, and it is checked whether or not there is a return of a normal signal from the slave station. At this time, since the slave station 20c is re-executing the switching between the left end terminal and the right end terminal, it receives the investigation signal and generates a normal signal when switching the right end terminal. Since this slave station 20c is located upstream of the failure point 200 position on the transmission path, the master station 10a can receive this signal.
Because a normal signal cannot be obtained from the downstream slave station,
The master station 10a determines that there is a failure in the transmission path between the slave stations 20G and 20d, and stores this information. And the master station 10
A gives the slave station 20c a mode switching command for the left terminal which is the terminal terminal of its own system.

As a result, the slave station 2 located upstream of the failure point 200
0c is set to be the left terminal terminal slave station of the master station 10a.

FIG. 7 shows a flowchart of the operation of the master station on the side of the failed transmission line, and FIG. 9 shows a flowchart of the operation of the slave station. The above operation of the station is shown in flowchart 1 in FIG.

Through the above operations, the configuration as shown in FIG. 6(d) is obtained, the failure point 200 is eliminated, and the master stations 10a and 1ob can again monitor and control all the slave stations.

Note that the return to the normal group configuration is performed by transmitting an investigation signal from the master station to the slave stations in the defective section and receiving a return of a normal signal in the same manner as described above.

According to this device, even if the transmission path is not duplicated, it is possible to monitor and control slave stations by backing up from other groups in the event of a failure in the transmission path, and therefore, equipment costs can be kept low. Moreover, effects such as extremely high reliability can be obtained.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with appropriate modifications within the scope of the gist thereof.For example, the above embodiments may be modified into two groups. Although it was explained in section (b) above, it can be dealt with in the same way in other cases.

[Effects of the Invention] As detailed above, according to the present invention, even if the transmission line is not duplicated, it is possible to monitor and control slave stations by backing up from other groups in the event of a failure in the transmission line. It is possible to provide a remote monitoring and control device that can be kept at low cost and has extremely high reliability.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the basic configuration of the present invention, Fig. 2 is a diagram showing the configuration after the failure point location has been eliminated in this device, and Figs. 3 and 4 are main part configurations of the slave station in the device of the present invention. Fig. 5 is a main part configuration diagram of the master station in the device of the present invention, Fig. 6(a),
~(d) is a block diagram for explaining the operation of this device, No. 7
The figure is a flowchart showing the 4e operation of the master station on the side of the faulty transmission line, FIG. 8 is a flowchart showing the operation of the master station that has received the relief signal, and FIG. , FIG. 10 is a diagram showing the configuration of a conventional device. 10a, 10b... Control center device (master station), 20a. ~20e... Controlled center device (slave station>, 100.100
a, 100b...Transmission path, 30.40...Transmission control unit, 30a, 40a-...Control communication unit, 30b, 40b
...Interface, 30c, 40c...
・Display communication section, 30d, 40d... Abnormality processing section, 30
e, 40e... Abnormality detection section, 30d, 40d... Abnormality processing section, 30e, 40e... Abnormality detection section, 50...
・Transmission circuit switching circuit. Applicant's Representative Patent Attorney Takehiko Suzue No. 1 Figure 2 Figure 3 Figure 4
噸-! To arrangement 1* Figure 5 Figure 6 (a) (b) UU Figure 6 (C) (d) Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] In a remote monitoring and control device in which a plurality of monitored and controlled devices are connected via a loop-shaped transmission path, the monitoring and control device sends various commands to each monitored and controlled device, and receives responses, the transmission path is one. In addition, at least two sets of monitoring and control devices are installed in each monitoring and control device, and each monitoring and control device has a group of monitored and controlled devices whose terminal terminal is a preset monitored and controlled device. When there is a communication error with a monitored control device in the own system, the control device outputs an investigation signal to each monitored control device in the own system to check whether communication is possible, and also sends a rescue signal to the monitoring control devices in other systems. means for determining a fault section of the own system based on the presence or absence of a normal signal of the monitored control device of the own system and giving a switching command to make the monitored control device before the fault section the terminal of the own system; When the rescue signal is received, the terminal monitored control device of the monitored control device in its own system is switched to the relay state, and an investigation signal is given to the subsequent monitored control device to determine the faulty section of the transmission path, and the fault is detected. means for outputting a command to switch the monitored controlled device before the section to the terminal terminal of its own system, and each monitored controlled device has a connection state with the transmission path such as left terminal, right terminal, There is a switching circuit that switches to the relay state, and when there is a communication error, this switching circuit is controlled to switch alternately to the left end terminal state and the right end terminal state, and when an investigation signal is received from the supervisory control device, a normal signal is sent to the transmission path and the relay state is established. A remote monitoring and control device characterized by being provided with a means for returning to the original state.